public void Solve()
{
var cin = new MyInputStream();
var N = cin.ReadInt();
var M = cin.ReadInt();
var c = new int[M, N];
const int START = -1;
const int GOAL = 0;
const int IMPENETRABLE = -2;
Point s = new Point();
for (int y = 0; y < N; ++y)
{
var line = cin.Read();
for (int x = 0; x < M; ++x)
{
switch (line[x])
{
case 's':
s = new Point(x, y);
c[x, y] = START;
break;
case 'g':
c[x, y] = GOAL;
break;
case '#':
c[x, y] = IMPENETRABLE;
break;
default:
c[x, y] = (int)(line[x] - '0');
break;
}
}
}
var dxy = new[] { -1, 0, 1, 0, -1 };
// ??????????brightness??????????????
Func <double, bool> Check = (brightness) =>
{
// ?????????????
var visited = new bool[M, N];
// bfs?????
var q = new Queue <Turn>();
// Turn( ?????, ??????????????, ?????)
q.Enqueue(new Turn(time: 1, bright: 10.0, pos: s));
while (q.Any())
{
var now = q.Dequeue();
// ???????????????brightness?????
if (now.b < brightness)
{
continue;
}
// ???????
if (visited[now.p.X, now.p.Y])
{
continue;
}
visited[now.p.X, now.p.Y] = true;
// ??????4??????
for (int i = 0; i < 4; ++i)
{
var nx = now.p.X + dxy[i];
var ny = now.p.Y + dxy[i + 1];
// ??????????
if (nx < 0 || nx >= M)
{
continue;
}
if (ny < 0 || ny >= N)
{
continue;
}
// ??????????????????????(?????)
if (visited[nx, ny])
{
continue;
}
// ????????????
if (c[nx, ny] == GOAL)
{
return(true);
}
// ?????????, ???????????????????
if (c[nx, ny] < 0)
{
continue;
}
// ?????????????????????
var nb = Math.Min(Math.Pow(0.99, now.t) * c[nx, ny], now.b);
q.Enqueue(new Turn(now.t + 1, nb, new Point(nx, ny)));
}
}
return(false);
};
// ???????????????????
if (!Check(0))
{
WriteLine(-1);
return;
}
// ???(??)????????????????
var l = 0d;
var r = 10d;
for (int i = 0; i < 50; ++i)
{
if (Math.Abs(r - l) < 1e-15)
{
break;
}
var mid = (l + r) / 2d;
if (Check(mid))
{
l = mid;
}
else
{
r = mid;
}
}
WriteLine(l);
}
public void Solve()
{
var cin = new MyInputStream();
N = cin.ReadInt();
M = cin.ReadInt();
c = new int[M, N];
const int START = -1;
const int IMPENETRABLE = -2;
Point s = new Point();
for (int y = 0; y < N; ++y)
{
var line = cin.Read();
for (int x = 0; x < M; ++x)
{
switch (line[x])
{
case 's':
s.X = x;
s.Y = y;
c[x, y] = START;
break;
case 'g':
c[x, y] = GOAL;
break;
case '#':
c[x, y] = IMPENETRABLE;
break;
default:
c[x, y] = (int)(line[x] - '0');
break;
}
}
}
// ???????????????????
if (!Check(0, s))
{
WriteLine(-1);
return;
}
// ???(??)????????????????
var l = 0d;
var r = 10d;
for (int i = 0; i < 50; ++i)
{
if (Math.Abs(r - l) < 1e-15)
{
break;
}
var mid = (l + r) / 2d;
if (Check(mid, s))
{
l = mid;
}
else
{
r = mid;
}
}
WriteLine(l);
}